Table 1.

Summary of Population Characteristics.

Characteristic		Total n=272	No BPD n=184	BPD n=88	p-value#
Mean (std dev) Gestational Age in weeks		28.5 (2.4)	29.6 (1.8)	26.2 (2.0)	<0.001
Mean (std dev) Maternal Age in years		27 (6)	27 (6)	26 (6)	0.077
Infant Gender (n (%))	Male	148 (54.4)	94	54	0.112
	Female	124 (45.6)	90	34
Maternal Race (n (%))	Non-Caucasian	55 (20.2)	40	15	0.373
	Caucasian	217 (79.8)	144	73
Chorioamnionitis* (n (%))	Yes	88 (32.4)	59	29	0.885
	No	161 (59.2)	109	52
	Unknown	23 (8.5)	16	7
Maternal Steroids (n (%))	Yes	240 (88.2)	170	70	0.002
	No	32 (11.8)	14	18
Multiple Birth (n (%))	Yes	67 (24.6)	48	19	0.458
	No	205 (75.4)	136	69
Prenatal Care* (n (%))	Yes	256 (94.1)	175	81	0.341
	No	13 (4.8)	8	5
	Unknown	3 (1.1)	1	2
Para** (n (%))	1	99 (36.4)	58	41	0.019
	2	94 (34.6)	66	28
	3	51 (18.8)	37	14
	4+	28 (10.3)	23	5
Gravida** (n (%))	1	87 (32.0)	56	31	0.445
	2	77 (28.3)	59	18
	3	49 (18.0)	28	21
	4+	59 (21.7)	41	18

^# p-values calculated using GEE logistic regression.

^*‘No’ and ‘Unknown’ were combined for comparison purposes.

^**Para 2, 3 and 4+ were combined for comparison purposes.

IUGR was considered but the sample size was insufficient for statistical analysis (total 29, BPD 9)